HE Adronomer Royal, who was prefent at the 
reading of this paper, expreffed a wifli that a 
particular account of the tnechanifm of the clock 
itfelf, might accompany the regider of its going ; as 
no confideration ought to be omitted which might 
ferve to elucidate thefe matters. 
My clock is in general of the plain kind, 
moving in brafs pivot-holes, beating dead feconds, 
with the common fteel paletts ; but of good work- 
manfhip, as being made by Mr. Holmes. The rod of 
the pendulum is of deal, as mentioned in a former 
paper ; to which the ball itfelf (weighing about four- 
teen pounds) is fcrewed fad, there being a fmaller 
weight underneath for a regulator. Its fufpenfion is 
fomewhat particular. The fpring A is not hung in 
a flit as is ufual ; but is fattened to a tranfverfe piece 
B, on which it refts upon the fides of the cock. 
The fhoulders of this piece confine the pendulum 
from any lateral motion, as much as it would be in 
a flit ; but it is at full liberty to hang perpendicularly 
under its point of fufpenfion, without any drain on 
either edge of the fpring above the other. The 
crutch is alfo of an unufual make. The bottom of 
the ftem, inftead of receiving the crutch-pin, is 
turned fideways ; at right angles to itfelf, but paral- 
lel to the back-plate. This piece D reaches about 
an inch, and at the end has a fmooth fleady joint E 
(known to the workmen by the name of a focket 
and dud), whofe axis lies horizontal. From that 
joint there is a return F, of equal length with the 
former piece ; at the end of which is the crutch-pin 
G, nearly coinciding with the end of the dem. 
7 
This 
